{"id":23539,"date":"2022-11-26T16:59:53","date_gmt":"2022-11-26T11:29:53","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-changing-one-list-happen-to-changed-back-up-list-duplicate\/"},"modified":"2022-11-26T16:59:53","modified_gmt":"2022-11-26T11:29:53","slug":"solved-changing-one-list-happen-to-changed-back-up-list-duplicate","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-changing-one-list-happen-to-changed-back-up-list-duplicate\/","title":{"rendered":"[Solved] Changing one list happen to changed back up list [duplicate]"},"content":{"rendered":"<p> [ad_1]<br \/>\n<\/p>\n<div id=\"answer-65462475\" class=\"answer js-answer accepted-answer js-accepted-answer\" data-answerid=\"65462475\" data-parentid=\"65462446\" data-score=\"0\" data-position-on-page=\"1\" data-highest-scored=\"1\" data-question-has-accepted-highest-score=\"1\" itemprop=\"acceptedAnswer\" itemscope itemtype=\"https:\/\/schema.org\/Answer\">\n<div class=\"post-layout\">\n<div class=\"votecell post-layout--left\"><\/div>\n<div class=\"answercell post-layout--right\">\n<div class=\"s-prose js-post-body\" itemprop=\"text\">\n<p>It is because you set y_2 to be the same list as y. That list is an object, and you created two references to that object. If you want to create an independent copy of the list you could use y_2 = list(y), or use the <a rel=\"nofollow noopener\" target=\"_blank\" href=\"https:\/\/docs.python.org\/3\/library\/copy.html\">copy module<\/a> in more complicated cases.<\/p>\n<p>Btw please just change that first line in to three lines; it would be a tremendous increase of readability.<\/p>\n<\/p><\/div>\n<div class=\"mt24\"><\/div>\n<\/div>\n<p>            <span class=\"d-none\" itemprop=\"commentCount\"><\/span> <\/p><\/div>\n<\/div>\n<p>[ad_2]<\/p>\n<p>solved Changing one list happen to changed back up list [duplicate] <\/p>\n","protected":false},"excerpt":{"rendered":"<p>[ad_1] It is because you set y_2 to be the same list as y. That list is an object, and you created two references to that object. If you want to create an independent copy of the list you could use y_2 = list(y), or use the copy module in more complicated cases. Btw please &#8230; <a title=\"[Solved] Changing one list happen to changed back up list [duplicate]\" class=\"read-more\" href=\"https:\/\/jassweb.com\/solved\/solved-changing-one-list-happen-to-changed-back-up-list-duplicate\/\" aria-label=\"More on [Solved] Changing one list happen to changed back up list [duplicate]\">Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[349],"class_list":["post-23539","post","type-post","status-publish","format-standard","hentry","category-solved","tag-python"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>[Solved] Changing one list happen to changed back up list [duplicate] - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-changing-one-list-happen-to-changed-back-up-list-duplicate\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] Changing one list happen to changed back up list [duplicate] - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] It is because you set y_2 to be the same list as y. 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